Posted on 04/05/2002 11:04:40 AM PST by GeneD
Scientists have found "intriguing" new evidence that may indicate there is life on Mars.
An analysis of data obtained by the Pathfinder mission to the Red Planet in 1997 suggests there could be chlorophyll - the molecule used by plants and other organisms on Earth to extract energy from sunlight - in the soil close to the landing site.
Researchers stress their work is in a very preliminary state and they are far from making definite claims.
Even so, the work is attracting much attention in the scientific community and will come under intense scrutiny when it is presented to an astrobiology conference in the US next week.
Dr Carol Stoker, from the American space agency's (Nasa) Ames Research Center, confirmed the findings to BBC News Online but cautioned that they were "not ready for the big time".
Early data
Mars Pathfinder mission touched down in the Ares Vallis region of Mars in July 1997. It took many images of the surrounding area and released a small rover to sample rocks.
A detailed analysis of the images of the landing site now reveals two areas close to Pathfinder that have the spectral signature of chlorophyll.
According to experts it might be highly significant - or could be just a patch of coloured soil.
Dr Stoker's team scrutinised the so-called Superpan, which is a high-resolution, highly processed series of superimposed images produced by Pathfinder's camera.
It is a multispectral panorama of the landing site recorded in 15 regions of the spectrum, and contains a wealth of information about rock types, colours and textures.
Knowing the spectral signature of chlorophyll, the researchers wrote a computer program that systematically scanned the Superpan for any pixels of interest.
Specifically, the program looked for the spectral signature associated with red light absorption by chlorophyll.
Previous searches for evidence of chlorophyll in Pathfinder's pictures were carried out shortly after it landed.
Some tentative indications were seen but they were later dismissed as "possible image misregistration".
Two patches
In Dr Stoker's study six regions of the Superpan matched positive for the chlorophyll signature.
For each of the regions, a full spectrum was plotted out and their exact position in the Superpan was then carefully examined.
All of the detections occurred close to the camera. This is to be expected say the researchers, as these are the areas where the camera has the highest sensitivity and resolution.
Close examination revealed that four of the cases occurred on the Pathfinder spacecraft itself. But two regions showed a chlorophyll signature in the soil around Pathfinder.
Given the controversial nature of their findings and the early stage of the research, the scientists want to hold back any claims about what they may have found until they have done more work and prepared a detailed paper for submission in a scientific journal.
It's almost not going to be surprising anymore to find life on Mars.
Exactly. I would be surprised if there weren't life on Mars and perhaps elsewhere in the solar system.
I have had more than one bright young student tell me that he or she wants to go into exo-biology or astro-biology.
I tell them (with a wink) "It's hard enough for the cosmologists and astrophysicists... unable to account for 90% of their subject matter... You want a field without any subject matter?"
But, of course, with amino acids found in nebulae, comets, meteors, it is probably just a matter of time.
Kinda creepy. isn't it? What's the possibility that Mars was once inhabited, but destroyed itself through war? Kaboom! No more martians, or the environmentalists they were fighting over land rights with?
There's enough to do here on earth for exobiologists. This chlorophyll matter alone has taken an enormous amount of preparation on earth, with subsequent useful spinoffs.
Why would anyone discourage a student? I tell my students if they really love it, if they have a passion for it, go for it.
Different light and a different angle might give you a picture of an angel.
Shouldn't that be xenobiologists?
Oh! Great! It would be surprising not to find extraterrestrial life. Anyway, I was advised, early in my career, that women, science, and babies don't mix. It was unheeded but correct advice.
You are correct. You may also be the only one paying attention.
I guess you've never watched Red Dwarf or whatever the name of that show is from the BBC. You'd know the answer is a most definite no
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.